CAT 6A Far-End Crosstalk Circuit With Matched Load Isolation

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Solution Overview

Problem

The existing standard circuit for far-end crosstalk of category 6A cables (CAT 6A) experiences significant fluctuations in the high frequency band due to parasitic crosstalk, which affects the reliability and controllability of the standard, thereby impacting device performance.

Innovation Solution

A standard circuit for far-end crosstalk of CAT 6A cables is designed by disconnecting all paths irrelevant to the test and connecting a matched load in series to avoid parasitic crosstalk, thereby enhancing the performance of the standard circuit.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If all pairs are connected in the standard circuit, then the circuit structure is complete and easy to manufacture, but parasitic crosstalk occurs in the high frequency band which reduces measurement reliability

Engineering Contradiction:

Improvecircuit structure completenessVSAvoidmeasurement reliability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent segments the circuit connections by disconnecting specific paths. The first received signal pair is disconnected from the second transmitted signal pair and second received signal pair, while maintaining connection between the first transmitted signal pair and second transmitted signal pair. This segmentation eliminates parasitic crosstalk paths while preserving the essential measurement function.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent extracts and removes the harmful element (parasitic crosstalk) by disconnecting the irrelevant signal paths. Specifically, the connection between the first received signal pair and the second transmitted/received signal pairs is removed, taking out the source of interference while maintaining the core measurement capability.

Inventive Principle:

Principle #2Taking out (Extraction)

2Reliability

If matched load is connected in series to avoid parasitic crosstalk, then measurement reliability improves, but device complexity increases

Engineering Contradiction:

Improvestandard controllabilityVSAvoidcircuit complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies local quality by adding the matched load (first load) specifically at the location where it is needed - in series with the second received signal pair. This localized modification targets the specific problem area (parasitic crosstalk in the received signal path) without unnecessarily complicating the entire circuit. The disconnecting of the first received signal pair from irrelevant paths also represents a localized structural change.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS12294345B2Standard circuit and standard for far-end crosstalk of category 6A cable (CAT 6A)

Publication Date: 2025.05.06 NATIONAL INSTITUTE OF METROLOGY CHINA

AI summary

A standard circuit for far-end crosstalk of a CAT 6A, including a first network connector and a second network connector. The first network connector includes a first transmitted signal pair and a first received signal pair. The second network connector is connected to the first network connector, and includes a second transmitted signal pair and a second received signal pair. The second transmitted signal pair is connected to the first transmitted signal pair. A first load is connected in series between the second received signal pair. A standard for far-end crosstalk of the CAT 6A is also provided.